A: Can I borrow your class notes from yesterday's lecture? B: Heck no! You're so lazy. A: What are you talking about? I was sick yesterday. B: I don't care. Ask someone else. A: You're so mean! B: I can't let anyone borrow my class notes. A: Why not? They're just notes. B: I let a classmate borrow my notes once, and she sold copies to people. A: That's crazy! For how much? B: She sold each class note set for $5. A: Don't worry, I promise not to sell your notes. B: I can't take your word for it.